An ion is an atom that has gained or lost one or more electrons and has thereby acquired a net electric charge. A negatively-charged ion is an anion; a positively-charged one is a cation.
Barystatic filters caused negatively-charged ion pollution. (TNG: "True Q")
The Chamra Vortex included ionized gas which interfered with sensors. (DS9: "Vortex")
Ion distribution needed to be checked when analyzing subspace infrared telemetry. (VOY: "Good Shepherd")
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